Tool carrier for lathes



Nov. 15, 192i 1,648,900

E. F. HEARD ET AL TOOL CARRIER FOR LATHES Filed Dec. 4, 1924 www,

7775/? A TTORNEYS Patentedf Nov. 15,1921. 13,648,900 UNITED STATESPATE-NT OFFICE.v

:PORT NEWS, VIRGINIA, ASSIGNORS T NEWPORT NEWS SHIPBUILDING & :DRY DOCKCOMPANY, OF NEWPORT NEWS, VIRGINIA, A CORPORATION OF VIRGINIA.

TOOL CARRIER FOR LATHES.

.Application led December 4, 1924. Serial No. 753,889.

Our invention relates to carriers for members operative upon thc workbeing treated in lathes and has for its object vthe pro? vision of animproved device of this char- 6 acter. More particularly, our inventionrelates to burnishing mechanismfor lathes, either of the single end typecommonly known as engine lathes, or of the double end center driventype.

An object of our invention is to save wear on the lathe centers byrelieving them of the thrust resulting from the use of a singloburnishing roller when rollburnishing axle and shaft journals and thelike, which desirable result is obtained by using la plurality ofrollers, so disposed that the strains set up by the pressures applied tothe 'axle or shaft are contained within a closed unit.

Another object is to increase the production per machine.

Our 4invention will be better understood from the following descriptiontaken in connection with the accompanying drawings and its scope will bepointed out in the appended claims.

In the drawings illustrating our invention:

Fig. 1 is a side view of our invention, with closed and open positionsindicated in full and broken lines respectively.

Fig. 2 is a plan view as viewed from the top1 of the lathe,with lathecenters indicated, an

Fig. 3 is a sectional view of one of the rollers, taken on the line 3-3of Fig. 1.

Referring to the drawings, in which 1 indicates a lathe carriage, whichhas fixed thereon in any suitable manner a bracket or holder 2 havingarms 3, 4, which support a pm or bolt 5, parallel with the center lineof the lathe centers 6, 7 as shown in Fig. 2. The bolt 5 is preferablyheld in a slot 5', the purpose of which will be pointed out herelnafter.The bolt 5 supports a curved V4.5 frame 8, as shown, which is providedwith a plurality of rollers 9, rotatable on pins 10. The lower free endof frame 8 has pivotally connected thereto on a pin or bolt 11 an arm orextension 12, which is also provided with a roller 9, rotatable on a pin10. The axes of the pins 10 are also parallel with the ,center line ofcenters 6, 7. While we do. not limit ourselves to any particular numberof rollers 9,` we preferably provide two of such rollers on the frame 8and one on the pivoted arm 12 arranged as shown in Fig. l. The free endof arm 12 has pivoted or hinged thereon on ins 13, a bolt 14, providedat its opposite en with a nut 15. Said free end of bolt 14 is adapted tolit into a slot 16 provided in the upper free end .of frame 8.

In order for our invention to function properly, it is necessary thatpins 10 supporting rollers 9 be parallel with the line through the lathecenters, and that the rollers 9 have no appreciable lateral movement ontheir pins. To accomplish this result, the rollers are provided withtapered roller bearings 17 and conical bearings 18 to permit easyrunningr with the minimum lost motion. As a further safeguard againstlost motion and lateral movement, the frame 8 is bored and threaded toreceive adjusting sleeves 19 which may be adjusted to bear against thebearings 18, and held in position by lock nuts 20.

In using our invention, the nut 15 is loosened, and hinged bolt14 isdisengaged from slot 16, which allows arm 12 to swing about its pivot 11to open position indicated in broken lines at X. The axle or shaft A, tobe Worked upon, is inserted, as shown in Fig. 1, and bolt 14reintroduced into slot-16. The nut 15 is tightened, bringing rollers 9into contact with said piece of work A. By tightening nut 15, thepressure between the work-A, and rollers 9 may be increased and sinceframe members 8 and 12 and bolt 14 constitute a lclosed system, andsince the bolt 5 is fitted in a slotted hole 5', there is no additionalstrain upon the lathe centers, due tdthe pressure of rollers 9 on thecen. ters 6, 7 about which the Work A is turning. It is necessary inorder to secure accuracy of the finished work that the rollers be maintained in a definite and xedrelation with each other. This requirementis fully complied .with by means of the threaded bolt 14 which holds theframe members rigidly together, thus preventing springing of the rollersdue toirregularities inthe work. If sulicient looseness is allowedbetween the cross-feed screw B of the lathe and" its nut, the slot-5 maybe omittedfand the necessary clearance to allow the mechanism to floatand accomodate itself to any irregularities or eccentric displacementsof the axle or shaft being burnished, may be obtained by moving theentire cross slide' carriage 1 to which the bracket 2 is fixed.

hen such articles like railway axles have shoulders to be burnished, aconsiderable pressure along the axes of pins 10 is necessary, and thereis therefore a tendency to rotate the frame and its appurtenances abouta vertical axis which passes through the pin 5. To overcome thistendency, stops 21, 22 are introduced on each side of the frame 8, theinside surfaces of the stops adjacent the frame being vertical planes.Thus it will be seen that the frame 8 with its appendages is free torotate within small limits about pin 5, while the thrust from theshoulder burnishing is taken by stops 21, 22.

This permits more intense pressure along the axis of pins 10 and at thesame time forces or tends to force the rollers 9 against the work Withequal intensity. l

While we have described our invention as embodied in concrete form inaccordancek with the provisions of the patent statutes, it should beunderstood that we do not limit our invention thereto, since variousmodifications thereof will suggest themselves to ythose skilled in theart without departing from the spirit of our invention, the scope ofwhich is set forth in the annexed claims.

What we claim and desire. to secure by United StateslLetters Patent is:

1. Burnishing apparatus comprising, a fixed support, a frame including asupporting member, said member beingpivoted centrally on said support soas to permit .movement thereof eccentrically with respect to the axis ofthe work to be burnished, rollers carried on said member at equaldistances at each side of said pivot, a second member pivoted'on thefirst member, a roller on said second member and so located thereon asto be spaced from the rst rollers by distances equal tothe spacing ofsaid rollers onv said ,supporting member andmeans for drawing member atequal distances from said sup-v port, a second member pivoted on thefirst member, a roller on said second member and so located thereon asto bes aced from the first rollers by distances equa to the spacing ofsaid rollers on said la-rcuate member, means for drawing said second`member toward the first member and means for preventing said frame frommoving longitudinally with respect to the work.

3. Burnishing apparatus comprising, a fixed support, a frame includingan arcuate member, said arcuate member being centrally pivoted andslidably mounted on said support at substantially the height of the axisof the Work to be burnished so as to permit movement thereofeccentrically with respect to the axis of the work, rollers car ried onsaid member at equal distances from said support, a second memberpivoted on the first member, a roller` on said second member and solocated thereon as to be spaced from the first rollers by distancesequal to the spacing of said rollers on said arcuate member, means fordrawing said second member toward thefirst member and meansfortpreventing said frame from moving longitudinally with respect to thework. Signed this 25th day of November, 1924.

EDMUND F. HEARD.` MAYO M. FITZ HUGH.

